# ----------------------------------------------------------------------
# http://code.djangoproject.com/wiki/PaginatorTag
# ----------------------------------------------------------------------
# Copyright (C) 2007-2019 The NOC Project
# See LICENSE for details
# ----------------------------------------------------------------------

# Third-party modules
from django import template

register = template.Library()


def paginator(context, adjacent_pages=2):
    """
    To be used in conjunction with the object_list generic view.

    Adds pagination context variables for use in displaying first, adjacent and
    last page links in addition to those created by the object_list generic
    view.
    """
    page_numbers = [
        n
        for n in range(context["page"] - adjacent_pages, context["page"] + adjacent_pages + 1)
        if n > 0 and n <= context["pages"]
    ]
    return {
        "hits": context["hits"],
        "results_per_page": context["results_per_page"],
        "page": context["page"],
        "pages": context["pages"],
        "page_numbers": page_numbers,
        "next": context["next"],
        "previous": context["previous"],
        "has_next": context["has_next"],
        "has_previous": context["has_previous"],
        "show_first": 1 not in page_numbers,
        "show_last": context["pages"] not in page_numbers,
    }


register.inclusion_tag("main/templatetags/paginator.html", takes_context=True)(paginator)
